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Aminet AMIGA CDROM (1994)(Walnut Creek)[Feb 1994][W.O. 44790-1].iso
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EIGHT.TXT
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1993-05-10
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CHAPTER 8. QUERIES AND HELP SCREENS
USER INQUIRIES (In)
The Inquiry command has eight options.
The most commonly used options display
the following information:
ATI3 Call duration
ATI4 Current settings
ATI5 NVRAM settings
ATI6 Link diagnostics summary
I0 The modem returns a 3-digit product
code. If you have a problem and call
USRobotics' Technical Support Depart-
ment, you may be asked for this
product code.
I1 The modem performs a checksum of its
read only memory (ROM) and returns
the result to the screen. This
function is used only in factory
testing. The modem should always
read the same number.
I2 The modem performs a test of its
random access memory (RAM) and
returns either the OK (0) or ERROR
(4) result code, followed by OK when
the test is completed. You may want
to use this command as a checkpoint
if the modem appears to be
malfunctioning.
I3 The modem returns the duration of the
last call if set to K0. It displays
the actual time if set to K1. See
the description of the Kn command in
Chapter 5.
I4 The modem displays its current
configuration. Figure 8.1 on the
following page is an example.
Figure 8.1êSample Result of ATI4 Command
I5 The modem displays the configuration
stored in nonvolatile random access
memory (NVRAM), as in the following
example.
Figure 8.2êSample NVRAM Settings Screen
I6 During a connection, the modem
monitors and stores information about
link operations. When the call is
ended, you can request a diagnostic
summary, as in the following example.
Figure 8.3êSample Link Diagnostics Screen
(ATI6)
For calls under data compression, the
number of characters sent may be less
than the number of octets sent, due to
buffering operations. Line Reversals
only applies to HST-mode operations,
when the modems switch the high and low
speed channels. At this time, online
fallback is only reported Enabled in HST
mode.
Most terms used in the display are self-
explanatory except for the following:
Octets: Compressed data units. If the
number of octets is greater than the
number of characters sent, the modems
probably used MNP5 compression on an
already compressed file, and the result
was expanded data.
Line Reversals: The number of times
HST-mode modems switched the high and
low speed channels.
Blers: Errors in data and protocol
blocks. If there were many block
errors, your receiver may have
experienced problems on the line.
Blocks Resent: These represent blocks
the remote modem resent due to the
previous category, Blers.
Link Timeouts: Protocol detection
problems: communications were severed
momentarily, and the modems probably
recovered. This does not indicate the
retry timeout.
Link Naks: Negative acknowledgments
(one or more blocks).
Data Compression: Indicates the type of
data compression negotiated for the call
(V42BIS or MNP5) or NONE. A V42BIS
response includes the size of the
dictionary and the maximum string length
used, for example, 2048/32. See
Appendix A for more information.
Equalization Long/Short: Status of S15
bit 0; long if bit 0=0, short if bit
0=1. Short equalization applies only to
HST modems.
Fallback: Enabled/Disabled: indicates
whether or not the modems negotiated
online fallback during the connection
sequence.
Protocol: Indicates the error control
protocol negotiated (LAPM, MNP, NONE) or
SYNC for a synchronous call.
Speed: The last rates at which the
receiver/transmitter were operating
before disconnecting.
Disconnect Reason: Possible reasons the
modem hung up are as follows:
DTR dropped: The DTE dropped the Data
Terminal Ready signal, terminating the
call.
Escape code: The operator sent the
modem the +++ escape code.
Loss of carrier: The modem detected
loss of the remote modem's carrier and
waited the duration specified in
Register S10 (default is 0.7 seconds).
Inactivity timeout: The modem
detected no activity on the line for
the duration specified in Register S19
(default is 0, timer disabled).
MNP incompatibility: The modem is set
to &M5 and the remote modem does not
have MNP capability, or there was an
MNP negotiation procedure error.
Retransmit limit: The modems reached
the maximum of twelve attempts to
transfer a data frame without error.
LD received: The remote modem sent an
MNP error control Link Disconnect
request.
DISC: The remote modem sent a V.42
Disconnect frame.
Loop loss disconnect: The modem
detected a loss of current on the loop
connecting it with the telephone
company central office. This usually
occurs because the remote modem has
hung up: the central office drops
current momentarily when there is a
disconnect at the other end of a call.
Unless Register S38 is set higher than
zero, the modem immediately hangs up
at loop loss.
Unable to Retrain: After several
attempts, disturbances on the phone
line prevented the modems from
retraining, and they could no longer
transmit or receive data.
Invalid speed: The modem is set to
&N1 or higher, for a fixed link rate,
and the remote modem is not operating
at the same rate.
XID Timeout: The modems failed to
negotiate the V.42 Detection (XID
Exchange) phase.
SABME Timeout (Set Asynchronous
Balance Mode Extended): The modems
failed this part of V.42 link
negotiation.
Break Timeout: Incompatible
processing of a Break signal occurred.
Invalid Codeword: The modem received
an invalid V.42 bis (compression)
frame.
A Rootless Tree: The modem received
an invalid V.42 bis (compression)
frame.
Illegal Command Code: The modem
received an invalid V.42 bis
(compression) frame.
Extra Stepup: The modem received an
invalid V.42 bis (compression) frame.
I7 The modem returns a product
configuration. If you have a problem
and call USRobotics' Technical
Support staff, you may be asked to
read this screen.
S-REGISTER QUERY (Sr?)
This command allows you to view the
contents of a particular S-Register, as
in the following example that requests
the contents of Register S0 ("On what
ring will the modem answer?"):
ATS0? <Enter>
PHONE NUMBER QUERY (&Zn?)
At this command, the modem returns the
phone number stored in NVRAM at position
n, as in the following example that
includes a sample modem response:
AT&Z3? <Enter>
5551234
LAST-DIALED NUMBER INQUIRY (DL?)
At this command the modem displays the
number stored in the last-dialed number
buffer:
ATDL?
HELP SCREENS
Courier modems provide four Help
screens: summaries of the basic AT
command set, extended ampersand (&)
command set, S-Register functions, and
Dial command options.
Stop/Restart Display
The following command stops the display.
Hold down the Control key and type "S":
<Ctrl>-S
To restart the display, use the same
command or press <any key>.
Cancel Display
Either of the following commands cancels
the display.
<Ctrl>-C
<Ctrl>-K
Basic Command Set ($)
At AT$, the Courier displays a screen
that shows a partial summary of the
command set. A second screen, activated
by pressing any key, shows the remaining
commands. The first screen is shown in
Figure 8.4.
Figure 8.4êSample Basic Commands HELP Screen
Extended Command Set (&$)
At AT&$, the Courier displays a screen
that shows a partial summary of the
extended ampersand command set. A
second screen, activated by pressing any
key, shows the remaining command set.
The first screen is shown in Figure 8.5.
Figure 8.5êSample Ampersand Commands HELP
Screen
Dialing (D$)
At ATD$, the Courier displays this Dial
command summary:
Figure 8.6êSample Dial Command HELP Screen
S-Register Functions (S$)
At ATS$, the Courier displays a screen
that shows a partial summary of the S-
Register functions. A second screen,
activated by pressing any key, shows the
remaining registers. The first screen
is as follows.
Figure 8.7êSample S-Register HELP Screen